feat(docs): complete P2.6 type safety cleanup and P2.7 system invariants

P2.6: Type Safety Cleanup
- Replaced 'any' return types in vite-plugin.ts with concrete types (UserConfig, transform return type)
- Documented TypeScript mixin 'any[]' exception in PlatformServiceMixin.ts
- Audit confirmed: zero 'any' in codebase except documented TS mixin limitation
- All external boundaries use 'unknown', all data payloads use 'Record<string, unknown>'

P2.7: System Invariants Documentation
- Created SYSTEM_INVARIANTS.md documenting all 6 enforced invariants
- Added to docs/00-INDEX.md under Policy & Contracts section
- Each invariant includes: What, Why, How, Where

Progress Docs Updates:
- Updated 00-STATUS.md: marked P2.6/P2.7 complete, added type safety invariant note
- Updated 01-CHANGELOG-WORK.md: added 2025-12-22 entries for P2.6/P2.7
- Updated 03-TEST-RUNS.md: added P2.6 type safety audit test run
- Updated P2-DESIGN.md: marked P2.6 acceptance criteria complete
- Updated SYSTEM_INVARIANTS.md: added Type Safety Notes section

Baseline Tag:
- Created v1.0.11-p0-p1.4-p1.5-p2.6-p2.7-complete

TypeScript compilation: ✅ PASSES
Build: ✅ PASSES
CI: ✅ All checks pass

docs/_archive/2025-legacy-doc/IOS_PHASE1_GAPS_ANALYSIS.md

@@ -0,0 +1,149 @@
+# iOS Phase 1 Gaps Analysis
+
+**Status:** ✅ **ALL GAPS ADDRESSED - PHASE 1 COMPLETE**  
+**Date:** 2025-01-XX  
+**Objective:** Verify Phase 1 directive compliance
+
+---
+
+## Directive Compliance Check
+
+### ✅ Completed Requirements
+
+1. **Core Methods (6/6)** ✅
+   - `configure()` ✅
+   - `scheduleDailyNotification()` ✅
+   - `getLastNotification()` ✅
+   - `cancelAllNotifications()` ✅
+   - `getNotificationStatus()` ✅
+   - `updateSettings()` ✅
+
+2. **Infrastructure Components** ✅
+   - Storage layer (DailyNotificationStorage.swift) ✅
+   - Scheduler (DailyNotificationScheduler.swift) ✅
+   - State actor (DailyNotificationStateActor.swift) ✅
+   - Error codes (DailyNotificationErrorCodes.swift) ✅
+
+3. **Background Tasks** ✅
+   - BGTaskScheduler registration ✅
+   - BGTask miss detection ✅
+   - Auto-rescheduling ✅
+
+4. **Build Script** ✅
+   - `scripts/build-ios-test-app.sh` created ✅
+
+---
+
+## ⚠️ Identified Gaps
+
+### Gap 1: Test App Requirements Document
+
+**Directive Requirement:**
+- Line 1013: "**Important:** If `doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md` does not yet exist, it **MUST be created as part of Phase 1** before implementation starts."
+
+**Status:** ✅ **NOW CREATED**
+- File created: `doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md`
+- Includes UI parity requirements
+- Includes iOS permissions configuration
+- Includes build options
+- Includes debugging strategy
+- Includes test app implementation checklist
+
+### Gap 2: Error Code Verification
+
+**Directive Requirement:**
+- Line 549: "**Note:** This TODO is **blocking for Phase 1**: iOS error handling must not be considered complete until the table is extracted and mirrored. Phase 1 implementation should not proceed without verifying error code parity."
+
+**Status:** ✅ **VERIFIED AND COMPLETE**
+
+**Verification Completed:**
+- ✅ Comprehensive error code mapping document created: `doc/IOS_ANDROID_ERROR_CODE_MAPPING.md`
+- ✅ All Phase 1 error scenarios mapped and verified
+- ✅ Semantic equivalence confirmed for all error codes
+- ✅ Directive updated to reflect completion
+
+**Findings:**
+- Android uses `call.reject()` with string messages
+- Directive requires structured error codes: `{ "error": "code", "message": "..." }`
+- iOS implementation provides structured error codes ✅
+- All iOS error codes semantically match Android error messages ✅
+- iOS error response format matches directive requirements ✅
+
+**Error Code Mapping:**
+- `"Time parameter is required"` → `MISSING_REQUIRED_PARAMETER` ✅
+- `"Invalid time format. Use HH:mm"` → `INVALID_TIME_FORMAT` ✅
+- `"Invalid time values"` → `INVALID_TIME_VALUES` ✅
+- `"Failed to schedule notification"` → `SCHEDULING_FAILED` ✅
+- `"Configuration failed: ..."` → `CONFIGURATION_FAILED` ✅
+- `"Internal error: ..."` → `INTERNAL_ERROR` ✅
+
+**Conclusion:**
+- ✅ Error code parity verified and complete
+- ✅ All Phase 1 methods covered
+- ✅ Directive requirement satisfied
+
+---
+
+## Remaining Tasks
+
+### Critical (Blocking Phase 1 Completion)
+
+1. ✅ **Test App Requirements Document** - CREATED
+2. ✅ **Error Code Verification** - VERIFIED AND COMPLETE
+
+### Non-Critical (Can Complete Later)
+
+1. ⏳ **iOS Test App Creation** - Not blocking Phase 1 code completion
+2. ⏳ **Unit Tests** - Deferred to Phase 2
+3. ⏳ **Integration Tests** - Deferred to Phase 2
+
+---
+
+## Verification Checklist
+
+### Code Implementation
+- [x] All Phase 1 methods implemented
+- [x] Storage layer complete
+- [x] Scheduler complete
+- [x] State actor complete
+- [x] Error codes implemented
+- [x] BGTask miss detection working
+- [x] Permission auto-healing working
+
+### Documentation
+- [x] Testing guide created
+- [x] Quick reference created
+- [x] Implementation checklist created
+- [x] **Test app requirements document created** ✅
+- [x] Final summary created
+
+### Error Handling
+- [x] Structured error codes implemented
+- [x] Error response format matches directive
+- [x] Error codes verified against Android semantics ✅
+- [x] Error code mapping document created ✅
+
+---
+
+## Recommendations
+
+1. **Error Code Verification:**
+   - Review Android error messages vs iOS error codes
+   - Ensure semantic equivalence
+   - Document any discrepancies
+
+2. **Test App Creation:**
+   - Create iOS test app using requirements document
+   - Test all Phase 1 methods
+   - Verify error handling
+
+3. **Final Verification:**
+   - Run through Phase 1 completion checklist
+   - Verify all directive requirements met
+   - Document any remaining gaps
+
+---
+
+**Status:** ✅ **ALL GAPS ADDRESSED - PHASE 1 COMPLETE**  
+**Last Updated:** 2025-01-XX
+